At 02:48 PM 3/25/99 -0600, you wrote: > > >Hi, > >I caught part of this discussion, and am wondering if anyone else has come >onto keys where the ratio is significantly different from bass to treble? >This summer I plan to change the ratio on one of our S&S D's that has >always been too high. Can't even get a decent dip without slamming the >jacks. I have forgotten the ratio numbers, but I do know that the capstans >formed a straight line about 1/4" out further in the treble than in the >bass. Never seen that before. >Dennis Johnson >St. Olaf College > Knuckle radius is important if you are changing the shanks, even if not; they could be cut off flush and a new slot cut for placing a knuckle at a better radius. It may be easier than having to not only move the capstan forwards, but to also cjange the cushion position and height. A 15.5 radius gets the hammer to the string faster (sooner) than a 17mm radius, ergo more after touch resulting in the jack possibly buring into the stop felt. But the system could be compounded with a capstan arc moving the wippen thru too great a distance. Remedied by moving the capstan forwards which decreases its arc and consequently moves the capstan further away from the wippen center (fulcrum) reducing its arc; all in all reducing jack travel. There's a lot of figuring and testing to come up with a combo which optimizes the action. Having shanks with the various knuckle executions and a wippen with a movable cushion (with inverted capstan) helps to zero in on opitmum settings. I know I'm leaving something out . . . Jon Page "I'm tryin' to think but nuttin' happens". ---- Curley
This PTG archive page provided courtesy of Moy Piano Service, LLC